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What's new:
-----------
- An IP-sampling profiler named 'profiler' has been added. It can be used
to profile any Cygwin program along with any DLLs loaded.
- A new tool 'gmondump' has been added. It can dump the raw information
of any "gmon.out" file created by profiler, ssp, or use of the gcc/g++
option '-pg'. (Continue using gprof to get symbolic profile displays.)
- New GNU-specific APIs, slated to become part of the next POSIX standard:
pthread_cond_clockwait, pthread_mutex_clocklock, pthread_rwlock_clockrdlock,
pthread_rwlock_clockwrlock, sem_clockwait.
- New Solaris-specific APIs, slated to become part of the next POSIX standard:
sig2str, str2sig.
What changed:
-------------
- The speed argument to cfsetspeed(3) can now be a numerical baud rate
rather than a Bnnn constant, as on Linux.
Addresses: https://cygwin.com/pipermail/cygwin/2021-July/248887.html
- The internal implementation of pipes has been overhauled; this
should result in improved performance.
Addresses: https://cygwin.com/pipermail/cygwin/2021-August/249238.html
Bug Fixes
---------
- Fix values returned by select(2) for shutdown sockets.
Addresses: https://cygwin.com/pipermail/cygwin-developers/2021-April/012092.html
- Introduce a new hypotl(3) function not suffering unnecessary overflows.
Addresses: https://cygwin.com/pipermail/cygwin/2021-April/248302.html
- Fix path handling for paths spanning native symlinks.
Addresses: https://cygwin.com/pipermail/cygwin/2021-April/248307.html
- Fix tab position evaluation after console window resize.
- Fix a regression in pseudo console handling, resulting in rlwrap not
being able to start a new pseudo console.
- Handle two race conditions in pseudo console usage.
Addresses: https://cygwin.com/pipermail/cygwin/2021-April/248292.html
- Fix a bug in recognizing a successful completion of connect(2) on a
datagram socket.
- Fix connect(2) when called with an address structure whose family is
AF_UNSPEC. As specified by POSIX and Linux, this is allowed on
datagram sockets, and its effect is to reset the socket's peer
address.
- Fix nanosleep(2) returning negative rem. NtQueryTimer appears to be able to
return a negative remaining time (less than the timer resolution) for
unsignalled timers.
- Fix getifaddrs(3) returning address family 0 or IPv4 address 0.
Addresses: https://cygwin.com/pipermail/cygwin/2021-July/248970.html
- Fix getaddrinfo(3) to return valid ai_socktype and ai_protocol values
if the underlying GetAddrInfoW screws up.
Addresses: https://cygwin.com/pipermail/cygwin/2021-July/248985.html
- Fix duplicate /proc/partitions entries and (presumably) duplicate PIDs
in ps(1) output.
Addresses: https://cygwin.com/pipermail/cygwin/2021-July/248998.html
https://cygwin.com/pipermail/cygwin/2021-August/249124.html
- Fix pty master closing error regarding attach_mutex.
Addresses: https://cygwin.com/pipermail/cygwin-developers/2021-October/012418.html
- Fix access violation that can sometimes occur when copy/pasting between
32-bit and 64-bit Cygwin environments. Align clipboard descriptor layouts.
Addresses: https://cygwin.com/pipermail/cygwin-patches/2021q4/011517.html
- Fix a synchronization issue when running multiple threads from DLL
initialization which in turn call malloc.
Addresses: https://cygwin.com/pipermail/cygwin/2021-October/249635.html
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